Conveners
Methods: Methods 1
- Arti Goyal (Astronomical observatory of the Jagiellonian University)
Methods: Methods 2
- Abigail Stevens (Michigan State U.)
The light curves of black hole X-ray binaries show variability on timescales from milliseconds to months. The variability is from X-ray-bright matter in the inner region of curved spacetime surrounding the black hole. We use Fourier techniques to identify timing signals such as quasi-periodic oscillations (QPOs) and intrinsic broadband/band-limited noise. These signals are not just due to...
To provide a detailed understanding of blazar and its environment, we study variability over diverse timescales using various statistical methods. As optical flux variations in blazars are often followed by spectral changes, thus we examine their colour – magnitude relationship on diverse timescales which helps us to understand the origin of variability. Presence or absence of correlation...
Most gamma-ray emitting AGN are variable and multiwavelength temporal studies provide insights into acceleration and radiation mechanisms, source size, radiative re-processing and source structure.
The gamma-ray band is very wide and is explored with very different techniques. In different energy
bands very different biases affect temporal studies. The biases have significant implication for...
Working with multi-messenger data comes with a variety of challenges. Ideally, one would like to take the prior information into account that the scientific object looks similar in neighbouring frequency channels. Moreover, data from radio telescopes has different statistical properties compared to data generated by gamma-ray telescopes: the former can be assumed to have Gaussian noise and the...
Active Galactic Nuclei emit radiation over the whole electromagnetic spectrum up to TeV energies. Blazars are one subtype with their jets pointing towards the observer. One of their typical features is extreme variability on timescales from minutes to years.
The fractional variability is an often used parameter for investigating the degree of variability of a light curve. By using public data...
The AstroSat, space-based Indian multi-wavelength observatory, provides an unique platform to enable the access of a very broad energy band (E~ 0.012 - 120.0 keV). It has also displayed the capability of observing hard X-ray polarization (e.g. 100-380 keV for Crab) for bright objects like bright GRBs, Crab, Cyg-1 etc. However, the timing capability of AstroSat has been displayed for a number...
The Cherenkov Telescope Array (CTA) is the next-generation ground-based gamma-ray observatory, currently in the prototyping and testing phase. CTA will consist of two arrays of imaging atmospheric Cherenkov telescopes, one in the Northern and one in the Southern hemisphere, reaching a sensitivity roughly five to ten times higher than existing instruments and covering an energy range from 20...
